Imagine one of those firm silicone straws. While someone is drinking from the straw, try to stop them by only being able to pinch the straw with your pinky and thumb in one small space. Now try to stop them by being able to grab the whole straw with your whole hand.

Women, generally, have a short urethra with weaker muscles. Men have a longer urethra with stronger muscles.

Women also have smaller bladders, and the muscles involved in their urinary track serve additional roles with the uterus and anus.